CUP Vs. PSI

[Lcl 66 Tinner]

Is there a conversion or formula for going to or from one or another?

[high country]

http://en.wikipedia.org/wiki/Copper_units_of_pressure

[JackOfAllTrades]

With reference to the previous link and definition...  No, I do not believe there is a reliable conversion between the two as CUP (copper or lead) is not considered as reliable as a piesoelectric reading of PSI. Most every modern reference to balistic pressures would be as PSI.
 
-Steve

[Lcl 66 Tinner]

Thanks for the info, some of the literature I have on loads is in CUP and some in PSI. Any other info you come up with would be good too.

[high country]

People often mistakenly write "psi" in place of "pressure"